A magnetic coupler with electromagnetic slip damping

Abstract

The present invention relates to the field of mechanical transmission technology, and specifically to a magnetic coupler with electromagnetic slip damping. The following scheme is adopted: comprising a first connecting shaft; a second connecting shaft, the second connecting shaft is coaxial with the first connecting shaft and is independently arranged; an inner permanent magnet carrier, coaxially fixed to the first connecting shaft, an inner permanent magnet is fixed on the outer peripheral surface of the inner permanent magnet carrier; an outer permanent magnet carrier, coaxially fixed to the second connecting shaft, the outer permanent magnet carrier is a cylindrical structure and is sleeved on the outer side of the inner permanent magnet carrier, an outer permanent magnet is fixed on the inner wall of the outer permanent magnet, and a gap is left between the outer permanent magnet and the inner permanent magnet; a conductor ring, located in the gap and relatively fixed to the inner permanent magnet carrier or the outer permanent magnet carrier. Through the arrangement of the conductor ring, soft starting can be achieved through asynchronous transmission when overloaded, and high-efficiency work can also be achieved through synchronous transmission.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical transmission, and in particular to a magnetic coupler with electromagnetic slip damping. Background Art

[0002] At present, the magnetic couplers (also known as permanent magnetic couplers or permanent magnetic couplings, etc.) used in the machinery industry are mainly divided into two categories: synchronous permanent magnetic transmission and asynchronous permanent magnetic transmission. Synchronous permanent magnetic transmission has no temperature rise and heat generation during operation and has high transmission efficiency, but it is easy to slip at full speed when encountering impact loads, or the large starting torque when starting with load is also easy to cause full-speed slippage; asynchronous permanent magnetic transmission has temperature rise and heat generation during operation and low efficiency, but it can have a certain slip difference at startup and has good starting characteristics. For equipment such as belt conveyors in the coal, steel, and electric power industries, a certain soft start is required during the startup process, and full speed operation and efficient transmission are required during the normal operation stage after startup. However, the existing magnetic couplers cannot meet the above requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defect that the magnetic coupler in the prior art cannot simultaneously meet the requirements of soft start and high efficiency, thereby providing a magnetic coupler that can achieve soft start and ensure high efficiency operation.

[0004] In order to solve the above technical problems, the present invention provides a magnetic coupler with electromagnetic slip damping, comprising:

[0005] a first connecting shaft;

[0006] a second connecting shaft, the second connecting shaft being coaxial with the first connecting shaft and independently arranged;

[0007] An inner permanent magnetic carrier is coaxially fixed on the first connecting shaft, and an inner permanent magnet is fixed on the outer peripheral surface of the inner permanent magnetic carrier;

[0008] An outer permanent magnetic carrier is coaxially fixed on the second connecting shaft, the outer permanent magnetic carrier is a cylindrical structure and is sleeved on the outer side of the inner permanent magnetic carrier, an outer permanent magnet is fixed on the inner wall of the outer permanent magnetic carrier, and a gap is left between the outer permanent magnet and the inner permanent magnet;

[0009] The conductor ring is located in the gap and relatively fixed on the inner permanent magnetic carrier or the outer permanent magnetic carrier.

[0010] Optionally, the conductor ring includes:

[0011] a main body ring, located in the gap and coaxial with the first connecting axis;

[0012] The flange ring is radially protruded on one end of the main body ring and is suitable for being fixedly connected to the end face of the inner permanent magnetic carrier or the end face of the outer permanent magnetic carrier.

[0013] Optionally, the first connecting shaft is provided with a first shaft shoulder, and the first shaft shoulder is fixedly connected to the end surface of the inner permanent magnetic carrier.

[0014] Optionally, also include:

[0015] A connecting ring, coaxially sleeved on the second connecting shaft;

[0016] The second connecting shaft is provided with a second shaft shoulder, the radial inner side of the connecting ring is fixedly connected to the second shaft shoulder, and the radial outer side of the connecting ring is fixedly connected to the outer permanent magnetic carrier.

[0017] Optionally, also include:

[0018] Thermal insulation ring;

[0019] When the conductor ring is relatively fixed to the inner permanent magnet carrier, the thermal insulation ring is located between the conductor ring and the inner permanent magnet; when the conductor ring is relatively fixed to the outer permanent magnet carrier, the thermal insulation ring is located between the conductor ring and the outer permanent magnet.

[0020] Optionally, the thermal insulation ring is asbestos or ceramic.

[0021] Optionally, the inner permanent magnet and / or the outer permanent magnet includes a plurality of permanent magnet blocks, and all the permanent magnet blocks are distributed in a Halbach array.

[0022] Optionally, the permanent magnet blocks are provided with multiple groups arranged in a cycle, each group includes permanent magnet block one, permanent magnet block two, permanent magnet block three and permanent magnet block four arranged in sequence, the pole of permanent magnet block one and the pole of permanent magnet block three are both located radially and opposite, and the pole of permanent magnet block two and the pole of permanent magnet block four are both located tangentially and opposite.

[0023] Optionally, the first connecting shaft, the second connecting shaft and the inner permanent magnetic carrier are all hollow structures.

[0024] Optionally, the first connecting shaft is suitable for connecting to a driving end, and the second connecting shaft is suitable for connecting to a load end.

[0025] The technical solution of the present invention has the following advantages:

[0026] 1. The magnetic coupler with electromagnetic slip damping provided by the present invention has a conductor ring added between the inner permanent magnet and the outer permanent magnet. The conductor ring cuts the magnetic flux lines in the gap and generates electromagnetic eddy current torque on the conductor ring. The electromagnetic eddy current torque generates a damping force to prevent the increase of the slip between the two sets of rotors. After the heavy load start or the impact load generates slip, the slip of the two sets of rotors is gradually reduced under the action of the damping force until they are coupled and synchronized again; in this way, soft start can be achieved through asynchronous start at startup, and high efficiency can be guaranteed through synchronous transmission during operation, thus having the advantages of both synchronous permanent magnet transmission and asynchronous permanent magnet transmission;

[0027] 2. The magnetic coupler with electromagnetic slip damping provided by the present invention adopts double permanent magnets to provide torque, has small size, light weight and high magnetic steel utilization rate;

[0028] 3. The magnetic coupler with electromagnetic slip damping provided by the present invention is provided with a heat insulating ring between the conductor ring and the permanent magnet, which can reduce the heat conduction from the conductor ring to the permanent magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a structural cross-sectional view of a magnetic coupler according to Embodiment 1 of the present invention;

[0031] Figure 2 It is a structural cross-sectional view of a magnetic coupler according to a second embodiment of the present invention;

[0032] Figure 3 This is a distribution diagram of the permanent magnet blocks of the present invention.

[0033] Description of reference numerals:

[0034] 1. First connecting shaft; 11. First shaft shoulder; 2. Second connecting shaft; 21. Second shaft shoulder; 3. Inner permanent magnet carrier; 4. Inner permanent magnet; 41. Permanent magnet block one; 42. Permanent magnet block two; 43. Permanent magnet block three; 44. Permanent magnet block four; 5. Outer permanent magnet carrier; 6. Outer permanent magnet; 7. Conductor ring; 71. Main body ring; 72. Flange ring; 8. Thermal insulation ring; 9. Connecting ring. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Embodiment 1

[0040] Reference Figure 1 The present invention provides a magnetic coupler with electromagnetic slip damping, comprising:

[0041] A first connecting shaft 1, suitable for connecting with the driving end;

[0042] A second connecting shaft 2, adapted to be connected to the load end, the second connecting shaft 2 being coaxial with the first connecting shaft 1 and independently arranged;

[0043] An inner permanent magnet carrier 3 is coaxially fixed on the first connecting shaft 1, and an inner permanent magnet 4 is fixed on the outer peripheral surface of the inner permanent magnet carrier 3;

[0044] An outer permanent magnetic carrier 5 is coaxially fixed on the second connecting shaft 2. The outer permanent magnetic carrier 5 is a cylindrical structure and is sleeved on the outer side of the inner permanent magnetic carrier 3. An outer permanent magnet 6 is fixed to the inner wall of the outer permanent magnetic carrier 5. A gap is left between the outer permanent magnet 6 and the inner permanent magnet 4.

[0045] The conductor ring 7 is located in the gap and relatively fixed on the inner permanent magnetic carrier 3 .

[0046] The magnetic coupler of the present application adopts double permanent magnets to provide torque, has small size, light weight, and high utilization rate of magnetic steel; and is additionally provided with a conductor ring 7, which is located between the two permanent magnets. The conductor ring 7 will cut the magnetic flux lines to generate electromagnetic eddy current torque, which generates damping force to hinder the increase of slip between the two groups of rotors. After heavy load starting or impact load generates slip, the slip of the two groups of rotors gradually decreases under the action of damping force until they are coupled synchronously again, thus realizing asynchronous starting and synchronous driving. It not only retains the soft starting advantages of asynchronous starting, but also retains the high efficiency of synchronous driving under normal working.

[0047] Reference Figure 1 This embodiment provides a preferred structure of a conductor ring 7, which specifically includes:

[0048] A main body ring 71, located in the gap and coaxial with the first connecting shaft 1;

[0049] The flange ring 72 is radially protruded from one end of the main body ring 71 and is suitable for being fixedly connected to the end surface of the inner permanent magnetic carrier 3 .

[0050] Preferably, the flange ring 72 is fixed to the end surface of the inner permanent magnetic carrier 3 by bolts.

[0051] With the above structure, the conductor ring 7 can be installed more conveniently and fixed more securely.

[0052] In other embodiments, the conductor ring 7 may also be fixed on the first connecting shaft 1 via a common connecting structure.

[0053] Reference Figure 1 This embodiment provides a preferred internal permanent magnetic carrier 3 fixing structure. Specifically, a first shaft shoulder 11 is provided on the first connecting shaft 1, and the first shaft shoulder 11 is fixedly connected to the end surface of the internal permanent magnetic carrier 3.

[0054] Preferably, the first shaft shoulder 11 is fixed to the end surface of the inner permanent magnet 4 by means of bolts.

[0055] Reference Figure 1 This embodiment provides a preferred external permanent magnetic carrier 5 fixing structure, including:

[0056] A connecting ring 9, coaxially sleeved on the second connecting shaft 2;

[0057] The second connecting shaft 2 is provided with a second shaft shoulder 21 , the radial inner side of the connecting ring 9 is fixedly connected to the second shaft shoulder 21 , and the radial outer side of the connecting ring 9 is fixedly connected to the outer permanent magnet carrier 5 .

[0058] Preferably, the connecting ring 9 is fixedly connected to the second shaft shoulder 21 and the outer permanent magnet carrier 5 by bolts.

[0059] Through the above structure, the outer permanent magnetic carrier 5 is fixed on the second connecting shaft 2 through the connecting ring 9 and the second shaft shoulder 21. The fixing structure is relatively simple and the fixing is relatively firm.

[0060] Reference Figure 1 This embodiment also provides an improved solution, including:

[0061] Thermal insulation ring 8;

[0062] When the conductor ring 7 is fixed relatively to the inner permanent magnet carrier 3 , the thermal insulation ring 8 is located between the conductor ring 7 and the inner permanent magnet 4 .

[0063] Preferably, the thermal insulation ring 8 is made of asbestos or ceramics.

[0064] Through the above solution, the heat insulation ring 8 can reduce the heat conduction between the conductor ring 7 and the inner permanent magnet 4, thereby avoiding the demagnetization of the inner permanent magnet 4 due to excessive temperature.

[0065] Reference Figure 3 , this embodiment also provides a preferred permanent magnet layout mode, the inner permanent magnet 4 and / or the outer permanent magnet 6 include multiple permanent magnet blocks, and all permanent magnet blocks are distributed in a Halbach array. Specifically, the permanent magnet blocks are provided with multiple groups arranged in a cycle, each group includes a permanent magnet block 1 41, a permanent magnet block 2 42, a permanent magnet block 3 43 and a permanent magnet block 4 44 arranged in sequence, the magnetic poles of the permanent magnet block 1 41 and the magnetic poles of the permanent magnet block 3 43 are both located in the radial direction and opposite, and the magnetic poles of the permanent magnet block 2 42 and the magnetic poles of the permanent magnet block 4 44 are both located in the tangential direction and opposite. By adopting the above structure, the permanent magnet can generate a stronger magnetic field.

[0066] In other embodiments, the angle and cycle period of each group of permanent magnets can be flexibly arranged according to the actual power demand and other usage requirements.

[0067] Reference Figure 1 In this embodiment, the first connecting shaft 1, the second connecting shaft 2 and the inner permanent magnetic carrier 3 are all hollow structures. The hollow structure can reduce the mass of the corresponding structure and reduce the resistance.

[0068] In this embodiment, the first connecting shaft 1 is suitable for connecting the driving end, and the second connecting shaft 2 is suitable for connecting the load end. Of course, in other embodiments, the two can also be interchangeable, that is, the first connecting shaft 1 is connected to the load end, and the second connecting shaft 2 is connected to the driving end.

[0069] As a specific implementation form, the working process of the magnetic coupler provided in this embodiment is as follows:

[0070] Before work, the first connecting shaft 1 is connected to the output end, and the second connecting shaft 2 is connected to the load end; when the set synchronous torque is not exceeded, the synchronous permanent magnet transmission method is adopted in both the starting and working states, and there is no temperature rise and heat generation phenomenon and the transmission efficiency is high; when the magnetic coupler encounters a load with a large starting inertia and exceeds the set synchronous torque, the asynchronous permanent magnet transmission method is adopted during startup, which can achieve soft start, and then the conductor ring 7 cuts the magnetic lines of force, and generates electromagnetic eddy current torque on the conductor ring 7, which hinders the increase of the slip between the two groups of rotors and promotes the synchronous coupling of the two groups of rotors, so that they are in the synchronous permanent magnet transmission mode under the working state, thus taking into account the advantages of asynchronous permanent magnet transmission and synchronous permanent magnet transmission.

[0071] Embodiment 2

[0072] Reference Figure 2 The magnetic coupling with electromagnetic slip damping provided in this embodiment is different from the embodiment 1 only in that:

[0073] In this embodiment, the conductor ring 7 is relatively fixed on the external permanent magnet carrier 5 , and the thermal insulation ring 8 is located between the conductor ring 7 and the external permanent magnet 6 .

[0074] In other embodiments, the conductor ring 7 may also be fixed on the second connecting shaft 2 via a common connecting structure.

[0075] It is worth noting that no matter the conductor ring 7 is fixed relative to the inner permanent magnet 4 or the outer permanent magnet 6, since the inner permanent magnet 4 and the outer permanent magnet 6 are relatively rotatable, a gap should be left between the conductor ring 7 and the other permanent magnet to avoid interfering with the rotation. Figure 2 The middle conductor ring 7 is fixed on the outer permanent magnet carrier 5 , so a certain gap should be left between the conductor ring 7 and the inner permanent magnet 4 .

[0076] In addition, in the present application, the conductor ring 7 is made of non-magnetic materials with high conductivity, such as aluminum (alloy), copper (alloy), etc.; the thermal insulation ring 8 is made of materials with low thermal conductivity, such as asbestos, ceramics, etc.; the inner permanent magnetic carrier 3 and the outer permanent magnetic carrier 5 can be made of non-magnetic materials or magnetic materials.

[0077] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A magnetic coupler with electromagnetic slip damping, characterized in that: include: A first connecting shaft (1); A second connecting shaft (2), the second connecting shaft (2) being coaxial with the first connecting shaft (1) and independently arranged; An inner permanent magnetic carrier (3) is coaxially fixed on the first connecting shaft (1), and an inner permanent magnet (4) is fixed on the outer peripheral surface of the inner permanent magnetic carrier (3); An external permanent magnetic carrier (5) is coaxially fixed on the second connecting shaft (2), the external permanent magnetic carrier (5) is a cylindrical structure and is sleeved on the outside of the internal permanent magnetic carrier (3), an external permanent magnet (6) is fixed on the inner wall of the external permanent magnetic carrier (5), and a gap is left between the external permanent magnet (6) and the internal permanent magnet (4); The conductor ring (7) is located in the gap and is relatively fixed to the inner permanent magnetic carrier (3) or the outer permanent magnetic carrier (5).

2. The magnetic coupling with electromagnetic slip damping according to claim 1, characterized in that: The conductor ring (7) comprises: A main body ring (71), located in the gap and coaxial with the first connecting axis (1); The flange ring (72) is radially protruded from one end of the main body ring (71) and is suitable for being fixedly connected to the end face of the inner permanent magnetic carrier (3) or the end face of the outer permanent magnetic carrier (5).

3. The magnetic coupling with electromagnetic slip damping according to claim 1, characterized in that: The first connecting shaft (1) is provided with a first shaft shoulder (11), and the first shaft shoulder (11) is fixedly connected to the end surface of the inner permanent magnetic carrier (3).

4. The magnetic coupling with electromagnetic slip damping according to claim 1, characterized in that: Also includes: A connecting ring (9) coaxially sleeved on the second connecting shaft (2); The second connecting shaft (2) is provided with a second shaft shoulder (21), the radial inner side of the connecting ring (9) is fixedly connected to the second shaft shoulder (21), and the radial outer side of the connecting ring (9) is fixedly connected to the outer permanent magnetic carrier (5).

5. The magnetic coupler with electromagnetic slip damping according to any one of claims 1 to 4, characterized in that: Also includes: Thermal insulation ring (8); When the conductor ring (7) is relatively fixed to the inner permanent magnetic carrier (3), the thermal insulation ring (8) is located between the conductor ring (7) and the inner permanent magnet (4); when the conductor ring (7) is relatively fixed to the outer permanent magnetic carrier (5), the thermal insulation ring (8) is located between the conductor ring (7) and the outer permanent magnet (6).

6. The magnetic coupling with electromagnetic slip damping according to claim 5, characterized in that: The heat insulating ring (8) is made of asbestos or ceramics.

7. The magnetic coupling with electromagnetic slip damping according to claim 1, characterized in that: The inner permanent magnet (4) and / or the outer permanent magnet (6) comprises a plurality of permanent magnet blocks, and all the permanent magnet blocks are distributed in a Halbach array.

8. The magnetic coupling with electromagnetic slip damping according to claim 7, characterized in that: The permanent magnet blocks are provided with a plurality of groups arranged in a cycle, each group comprising a permanent magnet block one (41), a permanent magnet block two (42), a permanent magnet block three (43) and a permanent magnet block four (44) arranged in sequence, the magnetic poles of the permanent magnet block one (41) and the magnetic poles of the permanent magnet block three (43) are both located radially and oppositely, and the magnetic poles of the permanent magnet block two (42) and the magnetic poles of the permanent magnet block four (44) are both located tangentially and oppositely.

9. The magnetic coupling with electromagnetic slip damping according to claim 1, characterized in that: The first connecting shaft (1), the second connecting shaft (2) and the inner permanent magnetic carrier (3) are all hollow structures.

10. The magnetic coupling with electromagnetic slip damping according to claim 1, characterized in that: The first connecting shaft (1) is suitable for connecting to a driving end, and the second connecting shaft (2) is suitable for connecting to a load end.

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